Crossword Genius

Best member of a Motown group (7)

Ross

I believe the answer is:

supreme

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'best' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

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(Other definitions for supreme that I've seen before include "Greatest, highest in excellence" , "Most important" , "Crowning" , "Paramount" , "Best of all" .)

I've seen this clue in The Times.
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